4.1.1 sd_probe........................................................................................................................................17
4.1.2 sd_remove......................................................................................................................................17
4.1.3 sd_shutdown..................................................................................................................................17
4.1.4 sd_init_command...........................................................................................................................18
4.1.5 sd_open..........................................................................................................................................18
4.1.6 sd_release.......................................................................................................................................18
4.1.7 sd_ioctl...........................................................................................................................................18
4.1.8 sd_media_change...........................................................................................................................19
4.1.9 sd_revalidate_disk.........................................................................................................................19
4.1.10 sd_rw_intr....................................................................................................................................19
4.2 SD Provided Entry points for the mid layer SCSI................................................................................19
4.3 SD Provided Entry points for the block device....................................................................................19
4.4 SD used Entry points from the mid layer SCSI....................................................................................20
4.5 SD used Entry points from the block device........................................................................................20
4.6 SD data structures.................................................................................................................................20
5.0 Overview of SCSI Unifying Mid Layer....................................................................................................22
5.1 SCSI Initialization................................................................................................................................22
5.2 SCSI BUS Scan ...................................................................................................................................22
5.3 IO Functionality....................................................................................................................................23
5.3.1 scsi_prep_fn...................................................................................................................................23
5.3.2 scsi_request_function....................................................................................................................24
5.3.3 scsi_done.......................................................................................................................................24
5.4 Error Handling Functionality................................................................................................................25
5.5 Data Structures......................................................................................................................................27
6.0 SCSI Low Level Driver............................................................................................................................41
6.1 SCSI Low Level Driver functional entry points...................................................................................42
6.1.1 bios_param.....................................................................................................................................42
6.1.2 detect..............................................................................................................................................42
6.1.3 eh_timed_out.................................................................................................................................42
6.1.4 eh_abort_handler...........................................................................................................................43
6.1.5 eh_bus_reset_handler....................................................................................................................43
6.1.6 eh_device_reset_handler................................................................................................................43
6.1.7 eh_host_reset_handler...................................................................................................................43
6.1.8 eh_strategy_handler.......................................................................................................................43
6.1.9 info.................................................................................................................................................44
6.1.10 ioctl..............................................................................................................................................44
6.1.11 proc_info......................................................................................................................................44
6.1.12 queuecommand............................................................................................................................44
6.1.13 release..........................................................................................................................................45
6.1.14 slave_alloc...................................................................................................................................45
6.1.15 slave_configure............................................................................................................................45
6.1.16 slave_destroy...............................................................................................................................45
6.2 Important Scsi_Host parameters set by the LLD..................................................................................46
6.3 Important Scsi_Cmnd parameters provided by SCSI mid layer...........................................................46
6.4 SCSI mid layer functions exported to LLD..........................................................................................48
References.......................................................................................................................................................49
List of Figures
Figure 1 - Linux File IO Transfer Overview.....................................................................................................8
Figure 2 - High-level overview of an IO transfer using block device driver..................................................11
Figure 3 - Linux SCSI SubSystem - Layered architecture..............................................................................14
Figure 4 - IO transfer using all the three layers..............................................................................................15
Figure 5 - SCSI Bus Scan...............................................................................................................................23
Figure 6 - SCSI IO Low and Midlevel IO transfer.........................................................................................41
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